Regarding the feeling of inferiority and creative power, Alexander Mueller, in Principles of Individual Psychology (unpublished manuscript), states:
To what extent is the feeling of inferiority a part of the normal development of a child and of human beings in general? According to a formulation by Adler: "to be human means to have a feeling of inferiority." "The historical progression of mankind is to be seen as the history of the feeling of inferiority, and man's attempt to conquer it." "Who can seriously doubt that the pitiful individual human being was given as a blessing a strong feeling of inferiority that strives for positiveness, security, and overcoming?" Adler, therefore, sees the development of mankind as the result of the overcoming of an inferiority feeling that, for better or for worse, is part of human nature.
Perhaps "creative power" can be described as something that we experience, but is not accessible to reason. If one considers character as not innate or fixed, then the question arises: who or what shapes character? Is it education or the environment and people close by, or is it what a person experiences in earliest childhood? Are events decisive or is it how we experience them? On what do how one relates to one's environment and to personal experiences and how the person assimilates them depend? These are questions to which no conclusive answers can be given. However, the following seems important to us: if one does not adhere clearly to determinism, then there remains a question mark with regard to the manner of human behavior. Neither predisposition nor environmental effects necessarily explain a person's basic behavior. The unique individual character entails an X-factor that can be traced back to nothing else but what we attempt describe as "creative power."